Update code to match latest changes to Mail::send() return value to null for all transport. Closes #6

Signed-off-by: crynobone <crynobone@gmail.com>
Add `Orchestra\Notifier\Receipt` as a unified receipt object on all e-mail sending.

Signed-off-by: crynobone <crynobone@gmail.com>
Re-add comment.

Signed-off-by: crynobone <crynobone@gmail.com>
Fixes test case on php 5.4

Signed-off-by: crynobone <crynobone@gmail.com>
Small fixes.

Signed-off-by: crynobone <crynobone@gmail.com>
Merge branch '2.2'